Why there are so many different function prototype for one function

[lypan]

http://www.cplusplus.com/reference/istream/istream/get/
I look the reference of std:istream:get and found that there are many function prototypes.
ex:
public member function
std::istream::get
<istream>
int get();
istream& get ( char& c );
istream& get ( char* s, streamsize n );
istream& get ( char* s, streamsize n, char delim );
istream& get ( streambuf& sb);
istream& get ( streambuf& sb, char delim );

then how do I know that which one function is called when calling get?
Thx in adhvance.

[Chervil]

See Overloaded functions
http://www.cplusplus.com/doc/tutorial/functions2/